/*
 * EmployeeSerializer.java
 * 
 * Copyright (c) 2008, Marshall Scorcio, Ralph Holzmann, 
 *                     Stewart Sweet, Tyler Hoersch, Jeffery Van Handel
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the University of Wisconsin Oshkosh nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */

import java.io.*;
import java.util.*;

public class EmployeeSerializer
{
    private static String fileName = "employees.dat";
    
    private static String status = "Employees Loaded.";
    
    public static void saveEmployees(Vector<Employee> employees) 
    {
        try
        {
            File file = new File(fileName);
            if (!file.exists())
            {
                file.createNewFile();
            }
        }
        catch (IOException e)
        {
        }

        try 
        {   
            FileOutputStream fileOut = new FileOutputStream(fileName);
            ObjectOutputStream out = new ObjectOutputStream(fileOut);
            
            for (int i = 0; i < employees.size(); i++)
            {        
                out.writeObject(employees.elementAt(i));
            }
            
            out.close();
            fileOut.close();
        }
        catch(FileNotFoundException e) 
        {
            e.printStackTrace();
        }
        catch (IOException e) 
        {
            e.printStackTrace();
        }
    }
    
    public static Vector<Employee> loadEmployees() 
    {
        Vector<Employee> employees = new Vector<Employee>();

        try 
        {
            FileInputStream fileIn = new FileInputStream(fileName);
            ObjectInputStream in = new ObjectInputStream(fileIn);
            
            while (fileIn.available() != 0)
            {
                Employee employee = (Employee) in.readObject();
                
                if (employee != null)
                {
                    employees.add(employee);
                }
            }

            in.close();
            fileIn.close();
        }
        catch (ClassNotFoundException e)
        {
            e.printStackTrace();
        }
        catch (FileNotFoundException e)
        {
            status = fileName + " not found. Adding some sample employees.";
            
            employees.add(new Employee("Ralph Holzmann", "0001", "Server", "ralphholzmann@gmail.com", 6));
            employees.add(new Employee("Jeffrey Van Handel", "0002", "Bartender", "vanhaj85@uwosh.edu", 8));
            employees.add(new Employee("Stewart Sweet", "0003", "Manager", "sweets60@uwosh.edu", 9));
            employees.add(new Employee("Tyler Hoersch", "0004", "Host", "hoerst88@uwosh.edu", 7));
            employees.add(new Employee("Marshall Scorcio", "0005", "Boss", "marshall.scorcio@gmail.com", 10));
            saveEmployees(employees);
        }
        catch (InvalidClassException e)
        {
            status = "The employee format has changed. Reverting to sample employees.";
            
            employees = new Vector<Employee>();
            employees.add(new Employee("Ralph Holzmann", "0001", "Server", "ralphholzmann@gmail.com", 6));
            employees.add(new Employee("Jeffrey Van Handel", "0002", "Bartender", "vanhaj85@uwosh.edu", 8));
            employees.add(new Employee("Stewart Sweet", "0003", "Manager", "sweets60@uwosh.edu", 9));
            employees.add(new Employee("Tyler Hoersch", "0004", "Host", "hoerst88@uwosh.edu", 7));
            employees.add(new Employee("Marshall Scorcio", "0005", "Boss", "marshall.scorcio@gmail.com", 10));
            saveEmployees(employees);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

        return employees;
    }
    
    public static String getStatus()
    {
        return status;
    }
}
